DE869805C - Process for the production of a spreadable agent for the selective regulation of plant growth - Google Patents

Description

Process for the preparation of a scatterable agent for selective Control of plant growth The invention relates to a method for Production of a spreadable agent for the selective: regulation of plant growth on soils or areas on which dicotyledonous plants (dicotyledons) destroy should be, while monocot plants not only not be damaged, but should be encouraged in their growth as far as possible.

It is known that 2, 4-dichlorophenoxyacetic acid and derivatives thereof Acid and salts of these acids exert a specific effect on dicotyledons., the growth of which is stimulated to such an extent that the excessive rapidity the growth leads to the death of the tall plants. As a result has in particular the sodium salt of 2,4-dichlorophenoxyacetic acid is used as a herbicide in cultures of monocotyledons, e.g. B. cereals, because when applying, this Salt the weed, e.g. B. Herderich, is destroyed. The application of this salt that only in very small amounts of z. B. to apply about r kg per hectare makes Difficulties, as spraying a dilute solution sometimes gives the farmer because it is unfamiliar and undesirable, and because of such dustiness one Solution there is a risk that the wind will spread parts of the sprayed salt solution onto neighboring fields carries, on which dicotyledons are to be cultivated, which are then severely damaged will. A mechanical mixing of the salt with a mineral one or other fertilizers also leads to difficulties, as a uniform Mixture is difficult or impossible to produce economically and there, a homogeneous one Mixing provided due to the different specific weights of the salt and the mineral fertilizer during transport and especially when spreading segregation occurs, which leads to the fact that the relatively easy and due the intimate mixture very finely powdered salt as a result of the segregation as floating Dust is blown into neighboring fields by the wind. These evils also lie then before, when superphosphate is excellently suited as a mixture former is chosen because of the non-alkaline. Response as found in In contrast to fertilizers with an alkaline reaction, it does not have any harmful effects the added salt of 2,4-dichlorophenoxyacetic acid or released from this salt Acid wields; in addition, -that -mixing, due to joint fine grinding the smearing of the thixotropic superphosphate is practically impossible: It it has now been found that the above-identified difficulties and advantages are eliminated can be achieved and that a spreadable, non-segregating, a proportionate low percentage of 2, 4-D, chlorophenoxyacetic acid or derivatives of this acid, containing their salts or addition products in uniform distribution, fertilizing, Spreadable agent for the selective influencing of the plant growth with destruction of the dskotyledons, that is, of the weeds, in. monocotyledon cultures, in particular Grasses and cereals, is obtained if 2, 4-dichlorophenoxyacetic acid or derivatives of these acids or salts of these acids by the superphosphate process, in particular with sulfuric acid, to be digested rock phosphate added and with it if possible be mixed evenly and go through the decomposition process with it ..

Surprisingly, it has been found that neither the high levels of acidity nor the high temperatures involved in the pouring process of rock phosphates the superphosphate process the effectiveness of 2, 4-dichlorophenoxyacetic acid or affect a compound of the acid or decompose this acid or unfavorable change and that the uniform distribution produced before the digestion during of the unlocking process is preserved and is still increased and on this Way a spreadable product is obtained in which also a small amount of active ingredient, z. B. r%, is evenly distributed and firm, .d. H. in the treatment conditions non-segregating, is incorporated.

Preferably the addition of 2, 4-dichlorophenoxyacetic acid, the z. B. is added in the form of their sodium salt, by grinding together made of the rock phosphate with this salt, with advantage, for. B. in a upstream mixing device, e.g. B. a ball mill, initially a higher percentage Premix of rock phosphate and 2, 4-dichlorophenoxyacetic acid or derivatives or Salts prepared and this concentrated mixture then, for. B. in the usual course of proceedings of the superphosphate process to the rock phosphate for the production of the starting mixture the desired concentration, e.g. B. about i, 70/0, either in the superphosphate process usual grinding plant, e.g. B. a ball mill, or after grinding the fine flour is added on its way from the mill to the mixer or in the mixer itself, which is charged with fine phosphate flour and acid. _ While, as mentioned above, a fine grinding of superphosphate with z. B. sodium salt of 2,4-dichlorophenoxyacetic acid is not possible because superphosphate is thixotropic. and so smear it with this grinding would, is such a fine grinding with rock phosphate, which is not thixotropic, without further possible. So it is, without making the process significantly more expensive and possible without significant change in the usual production process, the rock phosphate to add the desired small amount of the active ingredient evenly and the mixture then break up into superphosphate like normal rock phosphate.

Superphosphate, which has been brought into a spreadable form in a known manner can now segregate superphosphate and active ingredient during transport or spreading, which was incorporated into the superphosphate no longer result.

The proportions between superphosphate and the active ingredient are in itself arbitrary, but it must be taken into account that too high a content the active ingredient of the product to be sprinkled carries the risk of over-action, while a too low content of the product to be spread the necessity with brings itself to have to apply unnecessarily large amounts of fertilizer.

A content of the end product to be scattered of about i % 2, 4-dichlorophenoxyacetic acid or a salt, so that the rock phosphate about r, 7o / o of the active ingredient, e.g. B. in the form of the sodium salt, are added, as from z ton of rock phosphate 47 tons of superphosphate are produced.

An even distribution of about 7 kg of the sodium salt 2,4-Dichlorophenoxyacetic acid on roo kg of rock phosphate is readily as found became possible, and in this way a spreadable product is obtained with an optimal content of active ingredient.

Dust formation in the end product, if it occurs at all, is relatively harmless because the particles are relatively heavy of the superphosphate, of which the specifically light active ingredient is not can detach. In addition, dust can easily be prevented by known dust preventive agents such. B. binders, oil or the like, the presence of which can also be used to add the granules of the spread product to attach to the leaves of the plants. Such a Addition of a dust binder, e.g. B. Sulphite waste liquor, so can sometimes be an advantage so that the spreading is done in the way that the farmer is used to using fertilizer spreaders and can be done without observing special precautionary measures.

Also in other ways, e.g. B. by choosing special unlocking conditions, the superphosphate can be obtained in a non-dusting form, the one Danger of unwanted carrying away of the spread product by the wind impossible and creates a non-dusty, non-slip end product.

It has already been pointed out above that it was far from the Active ingredient of the rock phosphate before the superphosphate digestion process, (the under brutal conditions for organic compounds are carried out, add and that it is surprising when going through the superphosphate process no damage to the active ingredient occurs. It should also be noted here that it is true apparently the free acid from an added salt during the digestion process is released, but such a released acid or any addition products or conversion products of the acid formed in the process or Salts not only have no less effect than z. B. sprayed on as a solution Sodium salt of 2, 4-dichlorophenoxyacetic acid, but even an increase in Effect can occur, namely with regard to the effect of the litter product the monocotyledons, while the growth stimulation of the dicotyledons leading to the destruction has not become smaller, but rather larger. Examples i. 100 kg of Constantine rock phosphate (30% P.0.-content) together with 17 kg of the sodium salt of dichlorophenoxyacetic acid grind in a mill. The mixture is closed with 880 kg of sulfuric acid 53.5 ° Be in the usual way to 17% superphosphate, in which then 1% active ingredient is evenly involved.

2. 100 kg of Constantine rock phosphate (30% P2P5 content) are 13.3 kg of the sodium salt of dichlorophenoxyessi.gsäure ground in a mill. Before the The mixture is introduced into the mixing trough of a superphosphate digestion plant evenly mixed with goot kg of finely ground rock phosphate and then through 88o kg of sulfuric acid of 53.5 ° Be causes the digestion to superphosphate in the usual way. The final product contains about 170/0 phosphoric acid and assimilable for the plant o, 75% active ingredient.

3. 100 kg of rock phosphate are mixed with 8.9 kg of the sodium salt: dichlorophenoxyacetic acid ground in a mill. This mixture is made together with 90o kg of fine phosphate flour and 880 kg of sulfuric acid at 53.5 ° Be in the mixer of a superphosphate digestion plant supplied and processed in the usual way to superphosphate. The final product contains 0.5% active ingredient.

Claims (3)

PATENT CLAIMS: i. Process for the production of a spreadable agent for selective regulation of plant growth, characterized in that 2, 4-dichlorophenoxyacetic acid or a derivative of this acid or a salt of these acids is uniformly added to a rock phosphate in an amount corresponding to the amount desired in the product to be spread and that The mixture is subjected to the superphosphate digestion process to produce a pourable superphosphate product. 2. The method according to claim i, characterized in that the content of the rock phosphate of active ingredient, for. B. sodium salt of 2,4-dichlorophenoxyacetic acid before digestion is about 1.7 0/0 . 3. The method according to claim i or 2, characterized in that that a concentrated mixture of part of the rock phosphate and the total amount of the active ingredient, e.g. B. by joint grinding, especially in a = he ball mill, produced and this concentrate, preferably in the course of the usual superphosphate production, the rest of the rock phosphate in the mill, the fine flour between the mill and mixer or added to the mixer. q .. Method according to claims i, 2 or 3, thereby characterized in that a non-dusting, scatterable superphosphate product through Admixture of a dust binding agent, through appropriate choice of the digestion conditions or both means are produced.